To download the Readly app on your Apple device, your device must be at least iOS version 11 or higher.
For Android devices, the minimum required is version 4.0.3.
In the Kindle Fire, the minimum requirements for the operating system are also Android 4.0.3.
The apps are available for download here:
Google Play Store
Amazon App Store
If your device does not meet the system requirements, you can read in the browser using a PC without downloading an app. To read via browser, please visit go.readly.com